1. Immune System Skin is your first line of defense.
(Immune working with Integumentary)
Body secretions (mucus, oil, sweat, tears, and saliva) provide protection from pathogens.
● Tears and Saliva contain lysozyme-
an enzyme that can actually kill bacteria.
(Immune working with
Respiratory and Digestive)

2. If a pathogen gets past your skin, the next step is inflammation of the tissues.
Redness, Swelling, Pain, and Fever are all part of the immune response to rid your body of harmful agents.
White blood cells rush to the scene of the accident to prevent the spread of the pathogen.

3. They store and release the
Immune System
The organs, glands, and cells of the immune system provide protection.
They store and release the
white blood cells.

4. Types of White Blood Cells
Phagocytes (Fay-go-sites): white blood cells that surround, destroy, and digest invading organisms.
Lymphocytes (lim-fo-sites): are white blood cells that allow the body to remember and recognize previous invaders.

5. Lymphocytes B cells – T cells –
seek out pathogens and send antibodies (markers) to lock onto them
T cells –
T cells are like the soldiers, destroying the marked invaders.

6. Lymph nodes swell when you have a viral or bacterial infection
Glands and Organs
Lymph nodes: small masses of tissue that store white blood cells and filter pathogens from the body.
Where are they found in your body???
Lymph nodes swell when you have a viral or bacterial infection

7. Glands and Organs
stomach
The spleen stores white blood cells, and helps clean the blood (filtering out pathogens and dead red blood cells).

8. Glands and Organs
The Thymus gland stores white blood cells and releases a hormone that stimulates the production of white blood cells in the bone marrow.
(Immune working with Endocrine)

9. Check out the size of that needle!
Where are white blood cells made?
Check out the size of that needle!

10. Immune system and allergies
Things you are allergic to (dust, pollen, insect saliva, certain foods) cause your body to release histamine.
Histamine binds (like a puzzle piece) on to cells in the nose and throat.
histamine
Histamine is responsible for the symptoms you feel: inflammation, runny nose, constricted smooth muscle (asthma), itching.

11. Immune system and allergies
Anti-histamines are medicines you take to help with your allergies.
Anti-histamine
Nose cell
They block the nose and throat cell’s receptors so that the histamines cannot connect to the cells and cause runny nose and inflammation.